x86: make Voyager use x86 per-cpu setup.

Impact: standardize all x86 platforms on same setup code

With the preceding changes, Voyager can use the same per-cpu setup
code as all the other x86 platforms.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

arch/x86/Kconfig

@@ -133,7 +133,7 @@ config ARCH_HAS_CACHE_LINE_SIZE
 	def_bool y
 
 config HAVE_SETUP_PER_CPU_AREA
-	def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
+	def_bool y
 
 config HAVE_CPUMASK_OF_CPU_MAP
 	def_bool X86_64_SMP

arch/x86/kernel/setup_percpu.c

@@ -35,8 +35,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_number);
 DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
 EXPORT_PER_CPU_SYMBOL(this_cpu_off);
 
-#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
-
 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
 	[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
 };
@@ -125,6 +123,3 @@ void __init setup_per_cpu_areas(void)
 	/* Setup cpu initialized, callin, callout masks */
 	setup_cpu_local_masks();
 }
-
-#endif
-

arch/x86/mach-voyager/voyager_smp.c

@@ -531,7 +531,6 @@ static void __init do_boot_cpu(__u8 cpu)
 	stack_start.sp = (void *)idle->thread.sp;
 
 	init_gdt(cpu);
-	per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
 	per_cpu(current_task, cpu) = idle;
 	early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
 	irq_ctx_init(cpu);
@@ -1749,7 +1748,6 @@ static void __init voyager_smp_prepare_cpus(unsigned int max_cpus)
 static void __cpuinit voyager_smp_prepare_boot_cpu(void)
 {
 	init_gdt(smp_processor_id());
-	per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
 	switch_to_new_gdt();
 
 	cpu_set(smp_processor_id(), cpu_online_map);
@@ -1782,7 +1780,6 @@ static void __init voyager_smp_cpus_done(unsigned int max_cpus)
 void __init smp_setup_processor_id(void)
 {
 	current_thread_info()->cpu = hard_smp_processor_id();
-	percpu_write(cpu_number, hard_smp_processor_id());
 }
 
 static void voyager_send_call_func(cpumask_t callmask)